<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/Home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部提示区域 -->
      <el-alert title="注意: 只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="my_row">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- 
            v-model 选择项的数据
            options 所有选项的数据
            props 级联选择框的配置对象
          -->
          <el-cascader
            class="myCascader"
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs class="myTabs" v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDsiabled"
            @click="addParamsDialogVisible = true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable class="my_tag" v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input 
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="分类参数" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="small"
                  @click="showEditDialog(scope.row)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="small"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDsiabled"
            @click="addParamsDialogVisible = true"
          >添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable class="my_tag" v-for="(item, i) in scope.row.attr_vals" :key="i" @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input 
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="small"
                  @click="showEditDialog(scope.row)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="small"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addParamsDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form ref="addFormRef" :model="addForm" label-width="80px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editParamsDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form ref="editFormRef" :model="editForm" label-width="80px" :rules="editFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>


<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      selectedCateKeys: 0,
      // 级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        childrren: "children"
      },
      // 被激活的tab页签名
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加参数对话框的显示和隐藏
      addParamsDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: { attr_name: "" },
      // 添加参数的表单交验规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      // 控制修改参数对话框的显示和隐藏
      editParamsDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: { attr_name: "" },
      // 修改参数的表单交验规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      // 当前修改的商品分类
      row: "",
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.cateList = res.data;
    },
    // 当级联选择框的选中项发生改变, 会触发此函数
    handleChange() {
      this.getParamsData();
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData();
    },

    // 获取参数列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }

      // 证明选中的是三级分类
      // 根据所选分类的id, 和当前所处的面板, 获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta);
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];
        // 控制文本框的显示和隐藏
        item.inputVisible = false;
        // 文本框里的值
        item.inputValue = '';
      });

      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },

    // 监听对话框的关闭事件
    addDialogClosed() {
      // 清空输入框的内容
      this.$refs.addFormRef.resetFields();
    },

    // 关闭对话框重置输入框数据
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },

    // 点击按钮显示编辑对话框
    showEditDialog(row) {
      this.row = row;
      this.editParamsDialogVisible = true;
    },

    // 添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        // 如果校验不合格, 直接return
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg);
        }
        this.addParamsDialogVisible = false;
        this.$message.success("添加参数成功!");
        this.getParamsData();
      });
    },

    // 修改参数
    async editParams() {
      // 分类id
      let id = this.row.cat_id;
      // 属性id
      let attrId = this.row.attr_id;
      // 参数的属性值
      let attr_vals = this.row.attr_vals;
      const { data: res } = await this.$http.put(
        `categories/${id}/attributes/${attrId}`,
        {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName,
          attr_vals: attr_vals
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error(this.meta.msg);
      }
      this.$message.success("修改参数成功!");
      this.editParamsDialogVisible = false;
      this.getParamsData();
    },

    // 删除参数
    async removeParams(attr_id) {
      const confirmRes = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(error => error);

      if (confirmRes !== "confirm") {
        return this.$message.info("已取消删除");
      }

      // 用户点击确定之后执行业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.$message.success("删除参数成功!");
      this.getParamsData();
    },

    // 文本框失去焦点， 或摁下了Enter 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = '';
        row.inputVisible = false;
        return;
      }

      // 如果没有return 则证明输入的内容, 需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = '',
      row.inputVisible = false;
      // 需要发送请求保存这次操作
      this.saveAttrvals(row);
    },

    async saveAttrvals(row) {
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      });
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }

      this.$message.success(res.meta.msg);
      this.getCateList(row);
    },

    // 点击按钮显示文本框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获取焦点
      // nextTick 方法的作用, 就是当页面上元素被重新渲染之后
      // 才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      })
    },

    // 点击删除Tag标签, 删除参数
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrvals(row);
    }

  },


  computed: {
    isBtnDsiabled() {
      // 点击按钮判断如果不符合返回true
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      // 符合返回false
      return false;
    },

    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        // 如果选了三级分类那就把三级分类的id return出去
        return this.selectedCateKeys[2];
      }
      // 如果没有就返回null
      return null;
    },

    // 判断添加对话框的标题文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },

  }
};
</script>

<style lang="less" scoped>
.my_tag {
  margin-right: 10px;
  margin-top: 5px;
}

.input-new-tag {
  width: 100px;
}
</style>